condition mean min max ZT0-3 31.20445 31.20445 31.20445 ZT4-7 22.1042 22.1042 22.1042 ZT8-11 16.13655 16.13655 16.13655 ZT12-15 19.06945 19.06945 19.06945 ZT16-19 31.15925 31.15925 31.15925 ZT20-23 31.5475 31.5475 31.5475